GLAS is currently a dead-end element; I would be nice to have a SLCN-based CRMC factory that's not also a GLAS factory. 1+
EDIT: I just remembered that LITH with a carbonation factor (tmp2) of 3+ turns into molten GLAS when ignited so we'll need to make it so it can't turn GLAS into SLCN if it's carbonation factor is that high.
That dead-endness may be useful in its own right though, as a relatively inert element is needed soetimes
GLAS is not an inert element; inert means it can't be created or changed by reactions. GLAS is an exhausted element; an element that can be made by reactions but can't be changed into other elements by them, though the term is a bit of a gray area. Exhausted elements cause downcycling so a production line can end up with less finished product than raw material. There's no use for an element to be exhausted.
Sorry for possible necro.
LITH in it's explosion phase turns OXYG and itself into PLSM upon contact with OXYG.